Abstract

An analysis of a series of experiments using the least squares method(LSM) showed that the registration error of an induction watthourmeter in the presence of harmonics contained contributions fromthree aspects: the amplitudes obtained from the LSM analysis offrequency response test data which meant the max registration whenthe frequency and RMS of voltages and currents were not varied,only their phase angle varied, they decreased with the harmonicorder increasing; the phase shifts of voltage and current circuitswhich obtained from the LSM analysis of frequency response testdata too; and variances in the reported fundamental energy affectedby the harmonics.

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